12?2(m+3) |
(m+3)(m?3) |
?2(m?3) |
(m+3)(m?3) |
2 |
(m+3) |
(2)原式=
x(x+9) |
x(x+3) |
(x+3)(x?3) |
(x+3)2 |
(x+9) |
(x+3) |
(x?3) |
(x+3) |
2x+6 |
x+3 |
12 |
m2?9 |
2 |
m?3 |
x2+9x |
x2+3x |
x2?9 |
x2+6x+9 |
12?2(m+3) |
(m+3)(m?3) |
?2(m?3) |
(m+3)(m?3) |
2 |
(m+3) |
x(x+9) |
x(x+3) |
(x+3)(x?3) |
(x+3)2 |
(x+9) |
(x+3) |
(x?3) |
(x+3) |
2x+6 |
x+3 |